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A028493 a(n+1) = 3a(n) - (6-n)^2. 0
16, 12, 11, 17, 42, 122, 365, 1095, 3284, 9848, 29535, 88589, 265742, 797190, 2391521, 7174499, 21523416, 64570148, 193710323, 581130825, 1743392306, 5230176722, 15690529941, 47071589567, 141214768412 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

REFERENCES

Seen in a newspaper quiz.

MAPLE

(3^n + (5-n)*(6-n) + 1)/2;

CROSSREFS

Sequence in context: A008665 A076823 A070551 * A070534 A070577 A184752

Adjacent sequences:  A028490 A028491 A028492 * A028494 A028495 A028496

KEYWORD

nonn,easy

AUTHOR

Mark Orr (mjo(AT)cns.ed.ac.uk)

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.